Voltammetric response of a copper(II) complex incorporated in silica-modified carbon-paste electrode

Borgo, Claudemir Adriano; Ferrari, Rosilene Turquini; Colpini, Leda Maria Saragiotto; Costa, Creusa Maieru Macedo; Baesso, M. L.; Bento, A. C.

doi:10.1016/s0003-2670(98)00773-9

Cited by 37 publications

(9 citation statements)

References 33 publications

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“…This low midpoint and an anodic peak potential near zero are very important for sensor/biosensor development. In comparison with earlier results, this wave can be attributed to the process of transfer of an electron in the coupling, [41][42][43] …”

Section: Electrochemical Studiessupporting

confidence: 67%

Adsorption of a copper (II) complex on calcium phosphate intercalated with 4-aminobenzoic acid: synthesis and electrochemical investigation

Silva¹,

Souza²,

Santos³

et al. 2013

Quím. Nova

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Recebido em 14/2/13; aceito em 9/5/13; publicado na web em 17/7/13In this study, the adsorption isotherm of copper (II) on a calcium phosphate host intercalated with 4-aminobenzoic acid in an ethanol solution was investigated. This gave a maximum adsorption capacity of 1.74 mmol g -1 . The material was incorporated into a carbonpaste electrode, and its electrochemical properties were investigated. However, for a dopamine solution, the anodic peak current increased owing to the electrocatalytic oxidation. The electrode presented the same response for at least 150 successive measurements, showing good repeatability. The modified electrode is very stable and reproducible. The electrode sensor was successfully applied for dopamine determination in pharmaceutical preparations.

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Section: Electrochemical Studiessupporting

confidence: 67%

Adsorption of a copper (II) complex on calcium phosphate intercalated with 4-aminobenzoic acid: synthesis and electrochemical investigation

Silva¹,

Souza²,

Santos³

et al. 2013

Quím. Nova

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“…In this case, it was observed that the average potential was E m = 0.22 V, therefore, the isotherm of copper(II) cation was investigated, which is E m = (Ep c + Ep a )/2, where Ep a and Ep c are cathodic and anodic peak potentials, respectively. In comparison with some results obtained, this wave can be attributed to the following electron transfer process [23]:…”

Section: Electrochemical Studiessupporting

confidence: 61%

Construction of a New Sensor with Copper(II) Complex Anchored in Calcium Phosphate Intercalated with m-Aminobenzoic Acid and Their Application in Determination of Dopamine

Lazarin¹,

Benetti²,

Soares³

et al. 2022

J Trans Met Compl

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Crystalline lamellar calcium phosphate retained maminobenzoic acid inside its cavity without leaching. The intense infrared bands in the 1,033 cm −1 and 1,010 cm −1 intervals confirmed the presence of the phosphate groups attached to the inorganic layer, with sharp and intense peaks in X-ray diffraction patterns, which gave basal distances of 535 pm and 947 pm for the original and the intercalated compounds, respectively. The adsorption isotherm of copper(II) on a calcium phosphate host intercalated with maminobenzoic acid was studied in ethanol solution to give a maximum adsorption capacity of 1.43 mmoL g −1 . The material was incorporated into carbon paste electrode and its electrochemical properties were investigated. However, for a dopamine solution, an enhancement of the anodic peak current was detected due to the electrocatalytic oxidation. The electrode presented the same response for at least 150 successive measurements, with a good repeatability. The modified electrode is very stable and reproducible. The sensor was applied for dopamine determination in pharmaceutical preparation (one commercial sample (Revivan)) with success.

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“…It is speculated that such increase in current can be attributed to the possibility that electrochemical preanodization procedure can convert the copper into the highest oxidation state Cu 3 , which can strongly adsorb on the negatively charged silicate sol-gel network and acts as ef®cient electrocatalytic sites [4,12,20]. The conversion of metallic species to higher oxidation state via preanodization procedure has been reported [21], and the strong adsorption of copper complex in the sol-gel CCE appeared similar to that in a silica-modi®ed carbon-paste electrode [22]. Moreover, after electrochemical pretreatment, the CV response was very stable and reproducible.…”

Section: Electrochemistrymentioning

confidence: 83%

Amperometric Detection of Carbohydrates by Capillary Electrophoresis with a Cuprous Oxide Modified Sol-Gel Carbon Composite Electrode

et al. 2000

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A new sensitive electrochemical detector has been developed for the amperometric detection in capillary electrophoresis (CE). Chemically modi®ed sol-gel carbon composite electrodes (CCEs) containing cuprous oxide exhibit a sensitive electrocatalytic response for the oxidation of carbohydrates. The electrochemical pretreatment at 1.80 V (vs. SCE) for 60 s results in a marked enhancement of the current responses for all sugars examined, compared to the untreated electrode. A sample mixture containing 8 different sugars was separated within 30 min at an optimal constant potential of 0.65 V (vs. SCE). The stability of an electrochemically preanodized Cu 2 O-CCE was also investigated in CE experiments. The peak current reproducibility with this preanodized electrode over a period of 10 h was within 5 %. Calibration was linear over the concentration range from 2 to 400 mM with the limits of detection for the carbohydrates studied in the range of 0.75±1.3 mM.

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Voltammetric response of a copper(II) complex incorporated in silica-modified carbon-paste electrode

Cited by 37 publications

References 33 publications

Adsorption of a copper (II) complex on calcium phosphate intercalated with 4-aminobenzoic acid: synthesis and electrochemical investigation

Adsorption of a copper (II) complex on calcium phosphate intercalated with 4-aminobenzoic acid: synthesis and electrochemical investigation

Construction of a New Sensor with Copper(II) Complex Anchored in Calcium Phosphate Intercalated with m-Aminobenzoic Acid and Their Application in Determination of Dopamine

Amperometric Detection of Carbohydrates by Capillary Electrophoresis with a Cuprous Oxide Modified Sol-Gel Carbon Composite Electrode

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